US10511359B2ActiveUtilityA1
Transmission method with double directivity
Est. expiryJan 14, 2035(~8.5 yrs left)· nominal 20-yr term from priority
H04L 27/18H04B 7/043H04B 7/0434H04B 7/0469H04L 25/14H04L 27/2636
70
PatentIndex Score
5
Cited by
9
References
6
Claims
Abstract
The transmission structure of this transmission method decomposes in 103 the modulated symbols from 102 associated to a given constellation as the sum of Nm polar components that are modulated as Nm BPSK (Binary Phase Shift Keying) signals. Each of these BPSK signals can be regarded as an OQPSK (Offset Quadrature Phase Shift Keying) signal in the serial format that is specially designed to have good tradeoffs between reduced envelope fluctuations and a compact spectrum.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. Transmission method with double directivity comprising the following steps:
a. the data stream is split into N u sub-streams in ( 101 );
b. the data bits associated to each of the N u sub-streams are mapped by a modulator ( 102 ) into a symbol sequence of a given constellation (the constellation can be a M-QAM, M-PSK or Voronoi constellation) characterized by the ordered set ={S 0 , S 1 , . . . , S M−1 }, where M is the number of constellation symbols, following the rule
(β n (μ−1) ,β n (μ−2) , . . . ,β n (1) ,β n (0) ) s n ∈ ,
with (β n (μ−1) ,β n (μ−2) , . . . ,β n (1) ,β n (0) ) denoting the binary representation of n with μ=log 2 (M) bits;
c. the polar mapper ( 103 ) decomposes the constellations symbols in N m polar components, that are the result of the decomposition of signal s n into M components given by
s
n
=
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0
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g
1
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g
2
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(
1
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4
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2
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-
1
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eq
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,
with (γ μ−1,i γ μ−2,i . . . γ 1,i γ 0,i ) denoting the binary representation of i, b n (m) =(−1) β n (m) denoting the polar representation of the bit β n (m) , b n eq(i) =Π m=0 μ−1 (b n (m) ) γm,i denoting the i th polar component of s n and N m is the number of non-zero g i coefficients of the referred decomposition equation;
d. each of the N m polar components is modulated as a BPSK signal in ( 104 ), whose output is a time continuous BPSK signal, being each of these N m BPSK signal a serial representation of an OQPSK signal or a GMSK signal;
e. each of N m resulting signals Is submitted to a phase shifter ( 105 ) and it is amplified by a nonlinear amplifier ( 106 );
f. the N m signals associated to each sub-stream are transmitted by an arrangement ( 108 ) of N m ×N b antennas, arranged in N m sets of N b antenna elements or N b sets of N m antenna elements;
g. each arrangement ( 108 ) is composed by one or more sets of N m antennas ( 109 );
h. each arrangement ( 108 ) is composed by one or more sets of N b antennas ( 110 ), to allow horizontal beams.
2. Transmission method with double directivity according to claim 1 , in which the transmitter uses a massive MIMO (multiple input multiple output) scheme, with the antenna array composed by N u ×N m ×N b elements, arranged in N u sub-arrays, each one composed by N m sets of N b antenna elements or N b sets of N m antenna elements.
3. Transmission method with double directivity according to claim 1 , in which the spacing between the N m sets of N b antennas performs constellation shaping of the transmitted constellation.
4. Transmission method with double directivity according to claim 1 , in which the N m signals associated to each one of the N u sub-streams are combined in the transmission channel.
5. Transmission method with double directivity as in any one of claims 1 and 2 , in which each set ( 108 ) of N m ×N b antennas associated to the information stream for a user performs beamforming and several sets of N m ×N b antennas ( 108 ) in parallel implement;
a. spatial multiplexing;
b. antenna's interference management;
c. spatial multiplexing combined with antenna's interference management.
6. Transmission method with double directivity according to claim 1 , in which two kinds of directivities are implemented, one that affects the constellation shape of the transmitted constellation and another associated to the beamforming that affects the radiation pattern of the set of antennas.Join the waitlist — get patent alerts
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